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* Corresponding author 1 AeLos-GDD LINA - Laboratoire d-Informatique de Nantes Atlantique 2 GDD - Gestion de Données Distribuées Nantes LINA - Laboratoire d-Informatique de Nantes Atlantique 3 AELOS LINA - Laboratoire d-Informatique de Nantes Atlantique

Abstract : To implement a linearizable shared memory in synchronous message-passing systems it is necessary to wait for a time linear to the uncertainty in the latency of the network for both read and write operations. Waiting only for one of them suffices for sequential consistency. This paper extends this result to crash-prone asynchronous systems, proposing a distributed algorithm building a sequentially consistent shared snapshot memory on top of an asynchronous message-passing system where less than half of the processes may crash. We prove that waiting is needed only when a process invokes a read-snapshot right after a write. We also show that sequential consistency is composable in some cases commonly encountered: 1 objects that would be linearizable if they were implemented on top of a linearizable memory become sequentially consistent when implemented on top of a sequential memory while remaining composable and 2 in round-based algorithms, where each object is only accessed within one round.

Keywords : Asynchronous message-passing system Crash-failures Composability Sequential consistency Shared memory Snapshot





Author: Matthieu Perrin - Matoula Petrolia - Achour Mostefaoui - Claude Jard -

Source: https://hal.archives-ouvertes.fr/



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